143 lines
3.4 KiB
C++
143 lines
3.4 KiB
C++
// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
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#include "config.h"
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#include "base/basictypes.h"
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#include "gperftools/stacktrace.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdint.h>
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#if HAVE_LIBUNWIND_H
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#include <libunwind.h>
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#endif
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#include "run_benchmark.h"
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#if defined(__GNUC__) && defined(__has_attribute)
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#if defined(__linux__) && defined(__x86_64__) && defined(_LP64) && __has_attribute(naked)
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#include <stddef.h>
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#include <ucontext.h>
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#define BENCHMARK_UCONTEXT_STUFF 1
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extern "C" void getcontext_light(ucontext_t *ctx);
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#define R(r) offsetof(ucontext_t, uc_mcontext.gregs[r])
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__attribute__((naked))
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void getcontext_light(ucontext_t *ctx) {
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__asm__ __volatile__(
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"\tmovq %%rbx, %c0(%%rdi)\n"
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"\tmovq %%rbp, %c1(%%rdi)\n"
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"\tmovq %%r12, %c2(%%rdi)\n"
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"\tmovq %%r13, %c3(%%rdi)\n"
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"\tmovq %%r14, %c4(%%rdi)\n"
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"\tmovq %%r15, %c5(%%rdi)\n"
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"\tmovq (%%rsp), %%rcx\n"
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"\tmovq %%rcx, %c6(%%rdi)\n"
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"\tleaq 8(%%rsp), %%rcx\n" /* Exclude the return address. */
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"\tmovq %%rcx, %c7(%%rdi)\n"
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"\tret\n"
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: : "i" (R(REG_RBX)),
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"i" (R(REG_RBP)),
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"i" (R(REG_R12)),
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"i" (R(REG_R13)),
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"i" (R(REG_R14)),
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"i" (R(REG_R15)),
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"i" (R(REG_RIP)),
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"i" (R(REG_RSP)));
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}
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#undef R
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#endif
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#endif
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#define MAX_FRAMES 2048
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static void *frames[MAX_FRAMES];
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enum measure_mode {
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MODE_NOOP,
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MODE_WITH_CONTEXT,
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MODE_WITHOUT_CONTEXT
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};
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static int ATTRIBUTE_NOINLINE measure_unwind(int maxlevel, int mode) {
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int n;
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if (mode == MODE_NOOP)
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return 0;
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if (mode == MODE_WITH_CONTEXT) {
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#if BENCHMARK_UCONTEXT_STUFF
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ucontext_t uc;
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getcontext_light(&uc);
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n = GetStackTraceWithContext(frames, MAX_FRAMES, 0, &uc);
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#else
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abort();
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#endif
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} else {
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n = GetStackTrace(frames, MAX_FRAMES, 0);
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}
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if (n < maxlevel) {
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fprintf(stderr, "Expected at least %d frames, got %d\n", maxlevel, n);
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abort();
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}
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return 0;
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}
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static int ATTRIBUTE_NOINLINE frame_forcer(int rv) {
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#ifdef __GNUC__
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// aargh, clang is too smart and it optimizes out f1 "loop" even
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// despite frame_forcer trick. So lets resort to less portable asm
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// volatile thingy.
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__asm__ __volatile__ ("");
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#endif
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return rv;
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}
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static int ATTRIBUTE_NOINLINE f1(int level, int maxlevel, int mode) {
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if (level == maxlevel)
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return frame_forcer(measure_unwind(maxlevel, mode));
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return frame_forcer(f1(level + 1, maxlevel, mode));
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}
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static void bench_unwind_no_op(long iterations, uintptr_t param) {
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do {
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f1(0, param, MODE_NOOP);
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iterations -= param;
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} while (iterations > 0);
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}
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#if BENCHMARK_UCONTEXT_STUFF
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static void bench_unwind_context(long iterations, uintptr_t param) {
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do {
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f1(0, param, MODE_WITH_CONTEXT);
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iterations -= param;
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} while (iterations > 0);
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}
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#endif
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static void bench_unwind_no_context(long iterations, uintptr_t param) {
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do {
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f1(0, param, MODE_WITHOUT_CONTEXT);
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iterations -= param;
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} while (iterations > 0);
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}
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int main(void) {
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#if BENCHMARK_UCONTEXT_STUFF
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report_benchmark("unwind_context", bench_unwind_context, 1024);
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#endif
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report_benchmark("unwind_no_context", bench_unwind_no_context, 1024);
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report_benchmark("unwind_no_op", bench_unwind_no_op, 1024);
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//// TODO: somehow this fails at linking step. Figure out why this is missing
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// #if HAVE_LIBUNWIND_H
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// unw_set_caching_policy(unw_local_addr_space, UNW_CACHE_PER_THREAD);
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// #endif
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return 0;
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}
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